#include <iostream>
#include <cmath>
using namespace std;

int main() {
    int m, t, s;
    scanf("%d %d %d", &m, &t, &s);
    if (m == 0 || t == 0)
    {
        cout << 0 << endl;
        return 0;
    }
    int sum = s / t;
    if (s % t != 0) sum++;
    if (sum == 0) sum++;
    int n = m - sum;
    if (n <= 0)
        cout << 0 << endl;
    else
        cout << n << endl;
    return 0;
}